Philips-MCM-302-Service-Manual电路原理图.pdf

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1、CD Micro System TABLE OF CONTENTS3141 785 33420DB 09072009MCM302Location of PC Boards . 1-1Electronic Specification . 1-2Measurement Setup . 1-3Service Aids. 1-4Software Version Check & Upgrade . 2-1Malfuction Check Chart . 2-2Disassembly Diagram. 3-1Block Diagram . 4-1Wiring Diagram . 4-2Display Bo

2、ard . 5Circuit diagram . 5-1Layout diagram . 5-2Decoder Board . 6Circuit diagram . 6-1 to 6-3Layout diagram . 6-4Power Board. 7Circuit diagram . 7-1Layout diagram . 7-2Exploded View . 8-1Service Partlist . 9-1Factory Partlist . 10-1Version 1.0Location of PC Boards1-1VERSION VARIATIONS:Type /Versions

3、:FeaturesBoard in used:MCM302Service policyLCD DISPLAY BOARDCD DECODER BOARDPOWER BOARD* TIPS : C - Component Level Repair.M - Module Level Repair- Used/55/55/58/58/61/61/79/79/93/93/94/94/96/96/98/98/37/37/12/12/05/05Feature diffrenceRDSTDSVOLTAGE SELECTORECO STANDBY - DARKC CMMMMType /Versions:MCM

4、302Decoder Board Power BoardDisplay BoardAMPLIFIERRated Output Power .25W x 2RMSSignal-to-noise ratio .65dBAFrequency response. 60Hz20KHz 3.0dbAux Input.0.5V RMS 20k ohmDISCLaserType .SemiconductorDisc Diameter.12cm/8cmSupport Disc .CD-DA,CD-R,CD-RW,MP3Audio DAC .24Bits/44.1kHzTotal Harmonic Distort

5、ion . 0.1%(1kHz)Frequency Response .20Hz20kHzSignal to Noise Ratio .65dBATUNERFM Tuning Range .87.5108MHzTuning grid .100k/50kHzSensitivity- Mono, 26db S/N Ratio .5uV Stereo, 50dB S/N Ratio .100uVSelectivity .33dBImage Rejection .25dBTotal Harmonic Distortion .3%Signal to Noise Ration .65dBASPEAKERS

6、Speaker Impedance . 4ohmSpeaker Driver, base .4“Speaker Driver, tweeter .NAFrequency Response .60Hz20kHz 3.0dbeGENERAL INFORMATIONTotal Output power . 50W RMSAC Power . 230V / 50HzOperation Power Consumption . 25WStandby Power Consumption .4WEco Standby Power Consumption .1WHeadphone Output .2X15mV

7、32ohmUSB Direct .Version 1.1Dimensions Main unit (w x h x d) .200x115x250mm Speaker box (w x h x d).150x250x165mm SUBwoofer(w x h x d).NAWeight With Packing .6.75KG Main Unit .2.55KG Speaker box .2X1.7KG SUBwoofer.NASpecifications and external appearance aresubject to change without notice.1-2Electr

8、onic Specification1-3LF Generator e.g. PM5110RecorderUse Universal Test Cassette CrO2 SBC419 4822 397 30069LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metee.g. Sound Technology ST170LRDUTor Universal Test Cassette Fe SBC420 4822 397 30071LEVEL METERe.g. Sennheiser UPM550with FF

9、-filterS/N and distortion metere.g. Sound Technology ST1700BLRDUTCDUse Audio Signal Disc(replaces test disc 3)SBC429 4822 397 30184Bandpass250Hz-15kHze.g. 7122 707 48001LF Voltmetere.g. PM2534DUTS/N and distortion metere.g. Sound Technology ST1700BFrame aeriale.g. 7122 707 89001Tuner AM (MW,LW)To av

10、oid atmospheric interference all AM-measurements have to be carried out in a Faradays cage.Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).RF Generator e.g. PM5326Ri=50:Bandpass250Hz-15kHze.g. 7122 707 48001LF Voltmetere.g. PM2534DUTRF Generator e.g.

11、PM5326S/N and distortion metere.g. Sound Technology ST1700BUse a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).Ri=50:Tuner FMMEASUREMENT SETUP1-4SERVICE AIDSGB WARNINGAll ICs and many other semi-conductors aresusceptible to electrostatic discharges

12、(ESD).Careless handling during repair can reduce lifedrastically.When repairing, make sure that you areconnected with the same potential as the massof the set via a wrist wrap with resistance.Keep components and tools also at thispotential.ESDCLASS 1LASER PRODUCTGBSafety regulations require that the

13、 set be restored to its originalcondition and that parts which are identical with those specified,be usedSafety components are marked by the symbol!.Lead freeSet remains closed!NYPlay a CD for at least 10 minutesYplayabilityok ?Nplayabilityok ?add Info for customer“SET OK“check playabilityNYplayabil

14、ityok ?check playabilitycheck playabilityreturn setCustomer complaint“CD related problem“fast“ lens cleaning123For flap loaders (= access to CD drive possible)cleaning method 4 is recommendedINSTRUCTIONS ON CD PLAYABILITY1-Exchange CDM1 - 4 For description - see following pages1PLAYABILITY CHECKFor

15、sets which are compatible with CD-RW discsuse CD-RW Printed Audio Disc.7104 099 96611TR 3 (Fingerprint)TR 8 (600 Black dot) maximum at 01:00 playback of these two tracks without audible disturbanceplaying time for: Fingerprint t10secondsBlack dot from 00:50 to 01:10 jump forward/backward (search) wi

16、thin a reasonable timeFor all other sets use CD-DA SBC 444A.4822 397 30245TR 14 (600 Black dot) maximum at 01:15TR 19 (Fingerprint)TR 10 (1000 wedge) playback of all these tracks without audible disturbanceplaying time for: 1000 wedge t10secondsFingerprint t10secondsBlack dot from 01:05 to 01:25 jum

17、p forward/backward (search) within a reasonable time2CUSTOMER INFORMATIONIt is proposed to add an addendum sheet to the set whichinforms the customer that the set has been checkedcarefully - but no fault was found.The problem was obviously caused by a scratched, dirty orcopy-protected CD. In case pr

18、oblems remain, the customeris requested to contact the workshop directly. The lens cleaning (method 3) should be mentioned in theaddendum sheet.The final wording in national language as well as the printingis under responsibility of the Regional Service Organizations.4LIQUID LENS CLEANINGBecause the

19、 material of the lens is synthetic and coatedwith a special anti-reflectivity layer, cleaning must be donewith a non-aggressive cleaning fluid. It is advised to use“Cleaning Solvent The actuator is a very precise mechanical component andmay not be damaged in order to guarantee its full function.Clea

20、n the lens gently (dont press too hard) with a soft andclean cotton bud moistened with the special lens cleaner.The direction of cleaning must be in the way as indicated inthe picture below.Before touching the lens it is advised to clean thesurface of the lens by blowing clean air over it.This to av

21、oid that little particles make scratches onthe lens.INSTRUCTIONS ON CD PLAYABILITY1-2-1Software Version Check & UpgradeUpgrade softwareSoftware check2, Keep the “PLAY/PAUSE”and“STOP” buttons depressed at the same time while plugging the AC cord. the LCD Display shows:1, Make sure that the unit is di

22、sconnected with the AC supplier.1.Download the software from Philips support website2.Load the Software CD Disc or USB device with software, software upgrade procedure startsautomatically and it will be finish until you hear a long ding voice.http:/ yy3, Press the “PLAY/PAUSE” button once again , th

23、e LCD Display will shows:M302 Vxx2-2 Malfunction follow check chart Disassembly Diagram3-13-1A.Loosen these Screws(both sides & back)Side ViewC.Loosen these screws to remove Decoder Board B.Use thin screwdriver to unclench Top Cover F.Loosen these screws to remove Power BoardH.Loosen these screws to remove Display Board D.Loosen these screws to remove Dustproof Cover E.Loosen these screws to remove CD Loader Dirver Both sidesBack ViewACDEFH